[MacPorts] #72977: legacysupport: math.h: implement exp10* and roundeven* functions

[MacPorts]

#72977: legacysupport: math.h: implement exp10* and roundeven* functions
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  Reporter:  barracuda156    |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  legacy-support  |    Version:  2.11.5
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by fhgwright):

 I have an upcoming change to implement `__exp10` and `__exp10f`, but given
 that no macOS version supplies `__roundeven*`, it would be out of
 character for `legacy-support` to supply them.  If they ever appear in
 macOS, it must be via compiler builtins.

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Ticket URL: <https://trac.macports.org/ticket/72977#comment:2>
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